CN111845702A - Energy management method for plug-in hybrid electric vehicle - Google Patents
Energy management method for plug-in hybrid electric vehicle Download PDFInfo
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- CN111845702A CN111845702A CN202010795098.XA CN202010795098A CN111845702A CN 111845702 A CN111845702 A CN 111845702A CN 202010795098 A CN202010795098 A CN 202010795098A CN 111845702 A CN111845702 A CN 111845702A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention provides a plug-in hybrid electric vehicle energy management method.A vehicle control unit predicts the vehicle state of the next stage according to the current state information of the current vehicle speed, the current state information of the acceleration and the current state information of the current cabin temperature; calculating a required torque and a required heat of the passenger cabin; optimally distributing the power of the whole vehicle engine and the power of the motor; outputting control variables including engine power, motor power and heating resistance power; there are three modes of heating mode for the passenger cabin depending on the engine state: 1. independently heating by using the waste heat of the engine; heating by the HVAC heating resistor alone; 3. a hybrid heating mode. The invention reasonably distributes the electric quantity in the whole driving cycle, and improves the pure electric mileage; avoiding frequent starting of the engine; the waste heat of the engine is fully utilized, and the fuel consumption is reduced.
Description
Technical Field
The invention relates to the technical field of energy control of hybrid electric vehicles, in particular to an energy management method of a plug-in hybrid electric vehicle.
Background
In recent years, the continuous development of urban traffic and the continuous increase of automobile holding capacity have led to the increasing phenomenon of global fuel shortage and air pollution. For this reason, governments of various countries have made strict regulations on fuel consumption and emissions. In order to cope with these regulations, the automobile industry invests a great deal of effort in developing new energy automobiles. The PHEV, as the most representative technology in new energy automobiles, has good energy-saving and emission-reducing performances, and is widely applied to the field of urban traffic.
When the PHEV runs in winter, the energy consumed by heating the passenger cabin accounts for a large proportion of the energy consumption of the whole vehicle. Currently, PHEV cabin heating methods include: 1. the cooling liquid of the engine is used as a heat source to supply heat, which is called waste heat water heating type heating; 2. the heating resistor consumes the electric energy of the battery for heating.
The prior art describes a scheme for heating a passenger cabin of a plug-in hybrid electric vehicle, which combines waste heat water heating and heating resistance heating. The scheme is characterized in that when the engine works, the passenger cabin is heated by utilizing the waste heat of the engine, and when the engine stops working, the passenger cabin is heated by the heating resistor. The disadvantages of this technique are:
1. in the PHEV actual operation process, the engine is closed in the pure electric driving stage, if the passenger cabin is heated by the heating resistor at the moment, the SOC of the battery is reduced too fast, the pure electric mileage is greatly reduced, and the fuel consumption is inevitably increased.
2. The engine needs a warm-up process, and if the heat of the coolant is used to heat the passenger compartment, the warm-up process of the engine is prolonged and the working efficiency of the engine is reduced. And in order to utilize the waste heat of the engine for heating, the engine is frequently started, thus being not beneficial to energy conservation and emission reduction.
Disclosure of Invention
The invention provides an energy management method of a plug-in hybrid electric vehicle, which can avoid the problem that the SOC of a battery is reduced too fast and improve the pure electric mileage; avoiding frequent engine starts.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a plug-in hybrid electric vehicle energy management method comprises the following steps:
(1) receiving current state information of the vehicle, including current speed, acceleration, cabin temperature and engine temperature;
(2) the vehicle controller predicts the vehicle state of the next stage according to the current state information of the current speed, the acceleration and the cabin temperature;
(3) calculating a required torque and a required heat of the passenger cabin;
(4) optimally distributing the power of the whole vehicle engine and the power of the motor; optimizing the objective function F ═ F1+ F2; f1 is fuel consumption, f2 is engine starting penalty function;
(5) outputting control variables including engine power, motor power and heating resistance power;
(6) there are three modes of heating mode for the passenger cabin depending on the engine state: 1. independently heating by using the waste heat of the engine; heating by the HVAC heating resistor alone; 3. a hybrid heating mode.
Further, the specific process in the step (6) is as follows:
if the engine is not started, heating by adopting an HVAC heating resistor;
if the engine is started and the temperature of the engine does not reach the optimal working temperature, the engine cooling system is closed, and the HVAC heating resistor is used for heating independently;
if the engine is started and the engine cooling system is started, judging whether the waste heat of the engine meets the heating requirement of the passenger cabin, and if the waste heat of the engine cannot meet the heating requirement of the passenger cabin, adopting a mixed heating mode of the waste heat of the engine and an HVAC heating resistor; if so, the engine waste heat is adopted for independent heating.
The invention has the technical effects that:
(1) the electric quantity is reasonably distributed in the whole running cycle, and the pure electric mileage is improved;
(2) avoiding frequent starting of the engine;
(3) the waste heat of the engine is fully utilized, and the fuel consumption is reduced.
Drawings
FIG. 1 is a schematic view of a prior art cabin heating scheme for a plug-in hybrid vehicle;
FIG. 2 is a control flow diagram of the present invention;
FIG. 3 is a view showing a heating structure of a passenger compartment according to the embodiment;
fig. 4 is a torque distribution execution analysis diagram of the coaxial parallel plug-in hybrid vehicle according to the embodiment.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
The invention discloses a plug-in hybrid electric vehicle energy management method developed in a vehicle controller, which considers cabin thermal management, takes cabin required heat Q as an interference amount, and performs power optimization distribution on an engine and a motor. Fig. 2 is a control flow of the present invention. And the vehicle controller predicts the vehicle state of the next stage according to the current state information such as the current vehicle speed, the acceleration, the cabin temperature and the like. And the power of the whole vehicle engine and the power of the motor are optimally distributed. The method comprises the following specific steps:
(1) receiving current state information of the vehicle, including current speed, acceleration, cabin temperature and engine temperature;
(2) the vehicle controller predicts the vehicle state of the next stage according to the current state information of the current speed, the acceleration and the cabin temperature;
(3) calculating a required torque and a required heat of the passenger cabin;
(4) optimally distributing the power of the whole vehicle engine and the power of the motor; optimizing the objective function F ═ F1+ F2; f1 is fuel consumption, f2 is engine starting penalty function;
(5) outputting control variables including engine power, motor power and heating resistance power;
(6) according to the engine state:
if the engine is not started, heating by adopting an HVAC heating resistor;
if the engine is started and the temperature of the engine does not reach the optimal working temperature, the engine cooling system is closed, and the HVAC heating resistor is used for heating independently;
if the engine is started and the engine cooling system is started, judging whether the waste heat of the engine meets the heating requirement of the passenger cabin, and if the waste heat of the engine cannot meet the heating requirement of the passenger cabin, adopting a mixed heating mode of the waste heat of the engine and an HVAC heating resistor; if so, the engine waste heat is adopted for independent heating.
FIG. 3 is a schematic view of the cabin heating, engine warm-up phase with valves P1, P2, P3 closed; when the passenger cabin is heated by using the waste heat of the engine, the valve P1 is closed, and the valves P2 and P3 are opened. When the passenger compartment does not need to be heated, the valve P2 is closed.
In the embodiment of the application, take coaxial parallel hybrid vehicle as an example, this hybrid vehicle's control system includes engine temperature sensor node, main cabin temperature sensor node, the fast sensor node of wheel, 3 cooling system valve executor nodes, engine executor node, motor executor node, heating resistor executor node, vehicle controller, CAN network and directly link sensor etc.. The vehicle controller collects rotating speed signals, temperature information and driver instruction information through the CAN network and the sensor nodes, calculates and generates a torque control command and a heating resistance power instruction according to the acquired vehicle/wheel state information and the vehicle dynamics control requirement and the corresponding control strategy, and then sends the calculated torque control command and the calculated heating resistance instruction to each actuator node through the CAN network.
Fig. 4 is an analysis diagram of the torque distribution execution of the coaxial parallel plug-in hybrid electric vehicle according to the embodiment, and the process of the torque distribution of the coaxial parallel plug-in hybrid electric vehicle is as follows: firstly, an engine temperature sensor collects a current temperature signal of an engine, a cabin temperature sensor collects a current cabin temperature signal, a wheel speed sensor collects a current speed signal and sends the current speed signal to a vehicle controller through a CAN network, a receiving module of the vehicle controller receives the signal and a driver instruction, a torque control command is generated by calculation according to a vehicle dynamics control requirement and a corresponding torque distribution strategy, and then the torque commands of the engine and the motor are sent to the motor through the CAN network and the engine controller executes the torque command, so that the driving control of the vehicle is realized. In the process, the vehicle controller considers the heat requirement of the passenger cabin, optimizes and distributes the heat energy source of the passenger cabin, fully utilizes the preheating of the engine and realizes energy conservation.
Claims (2)
1. A plug-in hybrid electric vehicle energy management method is characterized by comprising the following steps:
(1) receiving current state information of the vehicle, including current speed, acceleration, cabin temperature and engine temperature;
(2) the vehicle controller predicts the vehicle state of the next stage according to the current state information of the current speed, the acceleration and the cabin temperature;
(3) calculating a required torque and a required heat of the passenger cabin;
(4) optimally distributing the power of the whole vehicle engine and the power of the motor; optimizing the objective function F ═ F1+ F2; f1 is fuel consumption, f2 is engine starting penalty function;
(5) outputting control variables including engine power, motor power and heating resistance power;
(6) there are three modes of heating mode for the passenger cabin depending on the engine state: 1. independently heating by using the waste heat of the engine; heating by the HVAC heating resistor alone; 3. a hybrid heating mode.
2. The plug-in hybrid electric vehicle energy management method according to claim 1, wherein the specific process in the step (6) is as follows:
if the engine is not started, heating by adopting an HVAC heating resistor;
if the engine is started and the temperature of the engine does not reach the optimal working temperature, the engine cooling system is closed, and the HVAC heating resistor is used for heating independently;
if the engine is started and the engine cooling system is started, judging whether the waste heat of the engine meets the heating requirement of the passenger cabin, and if the waste heat of the engine cannot meet the heating requirement of the passenger cabin, adopting a mixed heating mode of the waste heat of the engine and an HVAC heating resistor; if so, the engine waste heat is adopted for independent heating.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113147725A (en) * | 2021-03-29 | 2021-07-23 | 广西玉柴机器股份有限公司 | Method for controlling temperature maintenance of hybrid power engine and vehicle-mounted terminal |
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